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internal antenna for keyless go not working

S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

internal antenna for keyless go not working

Old 02-05-2019, 04:07 PM
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S550 w140, 07 S550
internal antenna for keyless go not working

I am getting an error message on STAR that my internal antenna in the backseat somewhere is not working.
I CAN unlock all the doors keyless-lly with no issues and start the car fine. Occasionally i get the key not recognize message if my key is inside my pocket on top of my wallet.
Anyone know where this antenna is or should I not even bother? It seems like in the back of the backseat but i can't find any antennas there.
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Old 02-05-2019, 05:14 PM
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Old 02-06-2019, 09:42 AM
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I would first update the Keyless Go module, clear the code and then see if it returns.
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